Are CNPC No.1 to No.6 Additives Effective?
3 Answers
CNPC No.1 to No.6 additives are effective and can clean carbon deposits in the engine. Below is relevant information about CNPC additives: Effects: Long-term vehicle use can accumulate a lot of carbon deposits, and CNPC additives can effectively remove carbon deposits inside the engine, especially in turbocharged engines. Usage Notes: The number of fuel-saving additive bottles to be added should be determined based on the engine displacement. For displacements below 1.8, add 1 bottle each time; for displacements between 2.0 and 3.0, add 2 bottles each time; and for displacements above 3.0, add 3 bottles each time. Frequency Caution: Frequent use of fuel additives can easily clog the three-way catalytic converter, especially for new cars, which do not produce excessive carbon deposits, so it is unnecessary to add too much fuel additive.
When I first bought my car, I tried Sinopec’s fuel additives, including their No. 1 to No. 6 series. I remember using the cleaning type, and after adding it, the engine sound became smoother, with a slight improvement in fuel consumption—especially making highway driving more stable. But honestly, the effects weren’t immediate; it depends on the car’s condition. If an older car has severe carbon buildup, these additives can help clean the fuel system and reduce wear. However, for well-maintained new cars, the benefits are minimal. Choosing which number to use depends on the functional description—No. 1 to No. 3 might be basic cleaning, while No. 4 to No. 6 are more advanced, like improving fuel efficiency. Don’t mix them randomly for convenience. I’d suggest trying a small amount first and not over-relying on them—regular oil changes and maintenance are more practical. Some friends who’ve tried them also reported effectiveness, but overall cost-effectiveness requires personal evaluation—don’t just trust the ads.
Having been in the transportation business for many years, I've used CNPC's additive series, numbers 1 to 6, which are mainly fuel additives for cleaning carbon deposits and protecting the fuel system. Adding them once can make the engine run smoother, especially for older trucks, extending their lifespan a bit. However, the effects aren't miraculous—they need to be combined with good gasoline and regular maintenance; additives alone can't solve major issues. The CNPC brand is reliable, with better quality than generic brands, and though slightly more expensive, it's trustworthy in terms of safety. I recommend that beginners not blindly go for higher-numbered additives but start with the basic No. 1 and upgrade only after reducing carbon deposits. I've used No. 4 myself, and it noticeably reduced engine noise, but don't expect overnight miracles—consistent driving habits are what really matter.
